Scott Marlowe escribió: > On Tue, Nov 11, 2008 at 10:58 AM, Sam Mason <sam@xxxxxxxxxxxxx> wrote: > > what is this "extra slop" needed for? > free space map and temp buffers. Not sure what else. Lock space, pg_clog, pg_subtrans and pg_multixact buffers, FSM, and some other things. External modules can request additional shared memory too. We're not very strict about the accounting. (temp buffers do not use shared memory -- what would be the point?) > Note that there could always be some other application using some > small amount of shared memory. use ipcs to see it. Run it as root to > see other user's / process's shared mem usage. shmmax is per-process. It's shmall that's system-wide, but that's measured in pages and is rarely a problem. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
